{
  "annotation_id": "e477013c-8bc6-4520-940f-a73474c64b7c",
  "date_created": "2026-03-02T18:01:56.463000Z",
  "date_modified": "2026-03-02T18:01:56.463000Z",
  "file_hash": "96a63cfcfd2385725750ac013b98faee79d27c2b96d0bc8003e6a387496e41d6",
  "private": false,
  "record": {
    "abstract": "The Bennett-Brassard cryptographic scheme (BB84) needs two bases, at least\none of them linearly polarized. The problem is that linear polarization\nformulated in terms of helicities is not a relativistically covariant notion:\nState which is linearly polarized in one reference frame becomes depolarized in\nanother one. We show that a relativistically moving receiver of information\nshould define linear polarization with respect to projection of\nPauli-Lubanski\u0027s vector in a principal null direction of the Lorentz\ntransformation which defines the motion, and not with respect to the helicity\nbasis. Such qubits do not depolarize.",
    "arxiv_id": "quant-ph/0303077",
    "authors": [
      "Marek Czachor",
      "Marcin Wilczewski"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.68.010302",
    "journal_ref": "Phys. Rev. A 68 (2003) 010302(R)",
    "title": "Relativistic BB84, relativistic errors, and how to correct them",
    "url": "https://arxiv.org/abs/quant-ph/0303077"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4b613548-2157-4cc7-9f99-a51f862030f9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}